In the picture below, is a circuit of constant direct current. The receiver is made of a changable resistor with resistance R. If the reciever delivers maximum electrical power its resistance is
a)9 b)6 c)3 d)1.5 e)0.5
Im having trouble finding the equation for this
The Attempt at a Solution
I cant find the theory of this curcuit, the equations that fit so can you guide me a little in any way that could help?